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盧泌成,金在雄 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1
For the control of building to external dynamic forces created by the wind or earthquake, many structural control method has been studied. Among those, a closed-loop feedback control algorithm is proposed for the control of a building using an active tuned mass damper. The passive-control device properties, including the stiffness and damping constants of the tuned mass damper and the gain coefficients of actuator, are derived by minimizing the displacement variance of the building. The results show that the control efficiency of the ATMD based on the velocity feedback depends on the passive-control-device properties assumed. Also, the ATMD with optimal passive properties using complete feedback results in further reduction in the structural displacement, the control force required is smaller using complete feedback.
예광일,박중석,노필성,김재웅 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1
The fact that with appropriate selection of the Ritz shapes, only a few of them can be used to represent adequately the response of the original system can be utilized very effectively in the forced response analysis of multi-degree-of-freedom systems. Obviously, a desirable set of Ritz vectors will be one that can adequately represent the spatial distribution of load by the superposition of a minimum number of shapes. It has been demonstrated that dynamic analysis based on Ritz vectors, which are generated by taking into account the spatial distribution of the load yield results which are more accurate than the use of the same number of exact mode shapes. However, because the dynamic response is influenced strongly by the exciting frequency, the exciting frequency in the use of Ritz analysis method is of considerable importance. In this paper, the influence of exciting frequency on Ritz analysis method is compared with mode superposition method with respect to displacement errors and base shear errors.